This can be proven for any valid argument form using a truth table which shows that there is no situation in which there are all true premises and a false conclusion.
Founded in 1994, IntraLearn Software Corporation (ISC) is a pioneer of creating e-Learning and Knowledge Organization products for corporate enterprises, academic institutions, associations, government agencies and training suppliers.
IDG evolved from International Data Corporation (IDC) which was formed in 1964 in Newtonville, Massachusetts, by Patrick Joseph McGovern, and his friend Fred Kirch. IDC is now a subsidiary of IDG. There is an international mother company (located in Boston), with several publications.